is fire. The twin who was bitten by the spiders is the one affected by the curse. Mark calls Laura and finds out Leigh is on her way. Laura tells him that Leigh is the one who was bitten, and Mark tells her to get out as fast as she can. As Laura is in the midst of packing, she suddenly has violent convulsions and visions of two of the men who died. It turns out that Laura is really the killer. She has long suffered from multiple personality disorder; Valerie is the expression of her feelings of inadequacy compared to Leigh. Valerie is also the only one who knows how to use Laura's curse. It turns out that Valerie has made several advances toward Leigh's boyfriends; when they turn her down, she turns into a spider and kills them. The only other people who know the secret are their mother, and their former nanny, Olga. Their mother has been in a catatonic state since seeing Valerie kill Leigh's fiancé. Leigh arrives and finds her mother in a panic. Suddenly, Valerie walks in, taunts Leigh and her mother by telling her about the things Laura never had the courage to say to Leigh. She also talks about how Leigh stole Laura's boyfriend, Gianni. She explains that Laura tried to win him back by seducing him, and unfortunately, Gianni ended up raping Laura and getting her pregnant. This caused Valerie to retaliate and kill Gianni, which was what their mother witnessed; she was babbling about Laura killing an Italian boy when Leigh found her, and it made her go crazy. Laura then turns into a spider. Horrified, their mother falls out of the window to her death. Valerie encases Leigh in webbing. Olga arrives minutes later and realizes Laura has to die. She goes to an old farmhouse to find Laura cowering on a stall. Laura admits that Valerie killed their mother, and hurt Leigh as well. As Olga pulls out a pistol, Valerie takes over, turns into a spider and kills Olga. Mark finds the place deserted and goes to the farmhouse. He finds Leigh, alive but terrified. Just then, Valerie arrives in spider form. Mark empties his pistol into her, to no avail. He hurls a lantern at Valerie, and she catches fire. Leigh and Mark escape, while Valerie sets the farmhouse ablaze as she thrashes about on fire.